What are the cheapest airlines to fly from Ottawa to Illinois one-way?

The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as C$ 215. However, be on the lookout for offers from WestJet and United Airlines, as they are both options that can get you from Ottawa to Illinois for a low price.

What are the most popular routes from Ottawa to Illinois?

Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Champaign University-Willard when deciding on the best route from Ottawa to Illinois.

What are the cheapest flights from Ottawa to Illinois?

Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 2,068, our data indicates the cheapest price to be C$ 249. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 494.

What are the most reliable airlines from Ottawa to Illinois?

Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: Avianca (89%), ANA (85%), GoJet( 82%).

How far in advance should I book a flight from Ottawa to Illinois?

Users have found that booking a flight from Ottawa to Illinois at least 41 days early can save you up to 83% on average compared to booking a flight this week. If booking 41 days before your flight isn’t an option for you, users have found flights from Ottawa to Illinois for as little as C$ 587 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as C$ 859 for flights departing within the next 3 days.

What is the cheapest month to fly from Ottawa to Illinois?

May is one of the best times of the year to fly to Illinois from Ottawa. Prices for May average C$ 570 per person but you can even find prices for as low as C$ 291. The most expensive prices can be found in the month of November. Opting for a May flight can save you 11% on your journey compared to booking in November

What airport do you fly from for flights from Ottawa to Illinois?

Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ottawa to Illinois?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

Can I find deals for business class flights from Ottawa to Illinois?

Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 215+ Flights from Ottawa to Illinois

Cheap flight deals from Ottawa to Illinois

Round-trip from	C$ 357
One-way from	C$ 215
Popular in	November
Cheapest in	May
Average price	C$ 617
Good round-trip deal	C$ 577 or less
Good one-way deal	C$ 366 or less

Porter Airlines
30/7-5/8
2 total stops
17h 02m total
Ottawa to Illinois

Search Deals

Porter Airlines
21/7
1 total stop
8h 49m total
Ottawa to Illinois

Search Deals

Highest demand for flights based on searches. 5% potential increase in price (C$ 43 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

Price to beat on a round-trip flight from Ottawa to Illinois.

Search Deals

Price to beat on a one-way flight from Ottawa to Illinois.

Search Deals

Find flight deals from Ottawa to Illinois

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.

Wed 30/78:35 a.m.YOW - MDW

1 stop8h 49mPorter Airlines

Tue 5/89:40 a.m.MDW - YOW

1 stop8h 13mPorter Airlines

Deal found 10/6C$ 357

Fri 25/75:55 a.m.YOW - MDW

1 stop11h 29mMultiple Airlines

Sun 27/79:40 a.m.MDW - YOW

1 stop8h 58mMultiple Airlines

Deal found 10/6C$ 447

Mon 23/63:50 p.m.YOW - ORD

1 stop18h 00mMultiple Airlines

Wed 25/65:51 a.m.ORD - YOW

1 stop8h 05mMultiple Airlines

Deal found 10/6C$ 494

Fri 4/75:25 p.m.YOW - ORD

Nonstop2h 28mUnited Airlines

Sun 6/76:15 p.m.ORD - YOW

Nonstop2h 20mUnited Airlines

Deal found 11/6C$ 514

Tue 1/76:00 a.m.YOW - ORD

1 stop4h 52mAir Canada

Sun 6/78:40 a.m.ORD - YOW

1 stop4h 04mAir Canada

Deal found 10/6C$ 528

Fri 29/86:00 a.m.YOW - ORD

1 stop11h 44mWestJet

Tue 2/95:30 p.m.ORD - YOW

2 stops21h 49mWestJet

Deal found 12/6C$ 647

Sat 16/85:55 a.m.YOW - ORD

2 stops8h 47mDelta

Mon 18/81:30 p.m.ORD - YOW

2 stops9h 52mDelta

Deal found 11/6C$ 786

Wed 9/75:25 p.m.YOW - STL

1 stop5h 10mUnited Airlines

Wed 16/75:00 a.m.STL - YOW

1 stop15h 35mUnited Airlines

Deal found 11/6C$ 798

Fri 1/810:00 a.m.YOW - STL

1 stop6h 21mAir Canada

Tue 5/81:30 p.m.STL - YOW

1 stop4h 35mAir Canada

Deal found 11/6C$ 800

Fri 27/65:55 a.m.YOW - MDW

2 stops16h 50mWestJet

Tue 1/712:44 p.m.MDW - YOW

2 stops10h 38mWestJet

Deal found 11/6C$ 813

Tue 8/75:55 a.m.YOW - MDW

2 stops12h 44mDelta

Tue 15/79:25 a.m.MDW - YOW

2 stops13h 57mDelta

Deal found 10/6C$ 826

Tue 17/64:10 p.m.YOW - STL

3 stops25h 35mMultiple Airlines

Thu 19/69:50 a.m.STL - YOW

3 stops13h 32mMultiple Airlines

Deal found 11/6C$ 1,027

Best flights from Ottawa to Illinois
Discover carefully curated flight deals from Ottawa to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 12 June 2025.

Wed 30/78:35 a.m.YOW - MDW

1 stop8h 49mPorter Airlines

Tue 5/89:40 a.m.MDW - YOW

1 stop8h 13mPorter Airlines

Deal found 10/6C$ 357

Fri 25/75:55 a.m.YOW - MDW

1 stop11h 29mMultiple Airlines

Sun 27/79:40 a.m.MDW - YOW

1 stop8h 58mMultiple Airlines

Deal found 10/6C$ 447

Fri 4/75:25 p.m.YOW - ORD

Nonstop2h 28mUnited Airlines

Sun 6/76:15 p.m.ORD - YOW

Nonstop2h 20mUnited Airlines

Deal found 11/6C$ 514

Tue 1/76:00 a.m.YOW - ORD

1 stop4h 52mAir Canada

Sun 6/78:40 a.m.ORD - YOW

1 stop4h 04mAir Canada

Deal found 10/6C$ 528

Fri 29/86:00 a.m.YOW - ORD

1 stop11h 44mWestJet

Tue 2/95:30 p.m.ORD - YOW

2 stops21h 49mWestJet

Deal found 11/6C$ 647

Sat 16/85:55 a.m.YOW - ORD

2 stops8h 47mDelta

Mon 18/81:30 p.m.ORD - YOW

2 stops9h 52mDelta

Deal found 11/6C$ 786

Mon 23/63:50 p.m.YOW - ORD

1 stop18h 00mMultiple Airlines

Wed 25/65:51 a.m.ORD - YOW

1 stop8h 05mMultiple Airlines

Deal found 10/6C$ 494

Wed 9/76:05 a.m.YOW - STL

2 stops10h 42mUnited Airlines

Wed 16/76:33 a.m.STL - YOW

1 stop14h 02mUnited Airlines

Deal found 11/6C$ 798

Fri 1/810:00 a.m.YOW - STL

1 stop6h 21mAir Canada

Tue 5/81:30 p.m.STL - YOW

1 stop4h 35mAir Canada

Deal found 11/6C$ 800

Fri 27/65:55 a.m.YOW - MDW

2 stops16h 50mWestJet

Tue 1/712:44 p.m.MDW - YOW

2 stops10h 38mWestJet

Deal found 11/6C$ 813

Tue 8/75:55 a.m.YOW - MDW

2 stops12h 44mDelta

Tue 15/79:25 a.m.MDW - YOW

2 stops13h 57mDelta

Deal found 10/6C$ 826

Direct flights from Ottawa to Illinois
Explore direct flight options from Ottawa to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 June 2025.

Fri 4/75:25 p.m.YOW - ORD

Nonstop2h 28mUnited Airlines

Sun 6/76:15 p.m.ORD - YOW

Nonstop2h 20mUnited Airlines

Deal found 11/6C$ 514

Fri 11/76:33 a.m.YOW - ORD

Nonstop2h 22mAir Canada

Sun 20/76:15 p.m.ORD - YOW

Nonstop2h 20mAir Canada

Deal found 12/6C$ 592

Last-minute flights from Ottawa to Illinois
Discover last-minute flight deals from Ottawa to Illinois. Data last updated 12 June 2025 and is based on user searches.

Tue 17/64:10 p.m.YOW - ORD

1 stop15h 27mMultiple Airlines

Tue 24/69:28 p.m.ORD - YOW

1 stop16h 28mMultiple Airlines

Deal found 9/6C$ 532

Tue 17/66:10 a.m.YOW - ORD

2 stops11h 34mWestJet

Thu 19/611:20 a.m.ORD - YOW

2 stops12h 02mWestJet

Deal found 11/6C$ 742

Tue 17/64:10 p.m.YOW - STL

3 stops25h 35mMultiple Airlines

Thu 19/69:50 a.m.STL - YOW

3 stops13h 32mMultiple Airlines

Deal found 11/6C$ 1,027

Tue 17/612:20 p.m.YOW - STL

2 stops12h 02mDelta

Thu 19/63:42 p.m.STL - YOW

2 stops7h 40mDelta

Deal found 11/6C$ 1,188

Tue 17/63:17 p.m.YOW - STL

1 stop7h 08mUnited Airlines

Thu 19/67:30 a.m.STL - YOW

1 stop4h 40mUnited Airlines

Deal found 11/6C$ 1,241

Tue 17/68:35 a.m.YOW - MDW

1 stop8h 49mMultiple Airlines

Thu 19/69:21 a.m.MDW - YOW

2 stops14h 01mMultiple Airlines

Deal found 11/6C$ 1,299

Thu 19/610:15 a.m.YOW - MDW

1 stop7h 09mPorter Airlines

Mon 23/69:40 a.m.MDW - YOW

1 stop7h 43mPorter Airlines

Deal found 9/6C$ 547

Thu 19/66:30 a.m.YOW - ORD

1 stop4h 29mAir Canada

Mon 23/68:25 p.m.ORD - YOW

1 stop4h 10mAir Canada

Deal found 9/6C$ 756

Thu 19/65:55 a.m.YOW - MDW

2 stops16h 50mWestJet

Mon 23/67:21 p.m.MDW - YOW

2 stops28h 01mWestJet

Deal found 9/6C$ 975

Thu 19/65:25 p.m.YOW - ORD

Nonstop2h 28mUnited Airlines

Mon 23/66:15 p.m.ORD - YOW

Nonstop2h 20mUnited Airlines

Deal found 9/6C$ 1,060

Thu 19/65:55 a.m.YOW - ORD

2 stops13h 08mDelta

Mon 23/69:00 a.m.ORD - YOW

2 stops14h 22mDelta

Deal found 10/6C$ 1,708

Mon 23/63:50 p.m.YOW - ORD

1 stop18h 00mMultiple Airlines

Wed 25/65:51 a.m.ORD - YOW

1 stop8h 05mMultiple Airlines

Deal found 10/6C$ 494

One-way flights from Ottawa to Illinois
Search for one-way flight options from Ottawa to Illinois. Find affordable one-way fares based on user searches. Data last updated 12 June 2025.

Mon 21/78:35 a.m.YOW - MDW

1 stop8h 49mPorter Airlines

Deal found 11/6C$ 215

Sun 10/85:55 a.m.YOW - MDW

1 stop27h 50mMultiple Airlines

Deal found 11/6C$ 246

Sat 26/711:20 a.m.YOW - ORD

2 stops13h 24mMultiple Airlines

Deal found 10/6C$ 283

Fri 25/76:10 a.m.YOW - ORD

2 stops11h 34mWestJet

Deal found 10/6C$ 290

Mon 21/75:25 p.m.YOW - ORD

Nonstop2h 28mUnited Airlines

Deal found 11/6C$ 291

Fri 11/78:35 a.m.YOW - ORD

1 stop5h 38mAir Canada

Deal found 10/6C$ 301

Fri 25/73:50 p.m.YOW - STL

1 stop23h 49mMultiple Airlines

Deal found 10/6C$ 312

Sat 19/75:55 a.m.YOW - MDW

2 stops7h 34mDelta

Deal found 10/6C$ 431

Sun 10/87:15 p.m.YOW - MDW

2 stops15h 01mWestJet

Deal found 11/6C$ 611

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 30/7

8:35 a.m.-4:24 p.m.

1 stop8h 49m

Chicago Midway

Tue 5/8

9:40 a.m.-6:53 p.m.

1 stop8h 13m

C$ 357

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 25/7

5:55 a.m.-4:24 p.m.

1 stop11h 29m

Chicago Midway

Sun 27/7

9:40 a.m.-7:38 p.m.

1 stop8h 58m

C$ 447

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 23/6

3:50 p.m.-8:50 a.m.

1 stop18h 00m

Chicago O'Hare Intl

Wed 25/6

5:51 a.m.-2:56 p.m.

1 stop8h 05m

C$ 494

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 4/7

5:25 p.m.-6:53 p.m.

Nonstop2h 28m

Chicago O'Hare Intl

Sun 6/7

6:15 p.m.-9:35 p.m.

Nonstop2h 20m

C$ 514

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 1/7

6:00 a.m.-9:52 a.m.

1 stop4h 52m

Chicago O'Hare Intl

Sun 6/7

8:40 a.m.-1:44 p.m.

1 stop4h 04m

C$ 528

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 29/8

6:00 a.m.-4:44 p.m.

1 stop11h 44m

Chicago O'Hare Intl

Tue 2/9

5:30 p.m.-4:19 p.m.

2 stops21h 49m

C$ 647

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 16/8

5:55 a.m.-1:42 p.m.

2 stops8h 47m

Chicago O'Hare Intl

Mon 18/8

1:30 p.m.-12:22 a.m.

2 stops9h 52m

C$ 786

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 9/7

5:25 p.m.-9:35 p.m.

1 stop5h 10m

Lambert-St Louis

Wed 16/7

5:00 a.m.-9:35 p.m.

1 stop15h 35m

C$ 798

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/8

10:00 a.m.-3:21 p.m.

1 stop6h 21m

Lambert-St Louis

Tue 5/8

1:30 p.m.-7:05 p.m.

1 stop4h 35m

C$ 800

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 27/6

5:55 a.m.-9:45 p.m.

2 stops16h 50m

Chicago Midway

Tue 1/7

12:44 p.m.-12:22 a.m.

2 stops10h 38m

C$ 813

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 20 results

Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Ottawa to Illinois

The most flights from YOW to USIL are scheduled on a Monday (12 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in Illinois by month

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 mm per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

Reviews of airlines servicing Illinois

Get a feel of what it's like to fly with Porter Airlines, Delta and United Airlines from Ottawa to Illinois by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!

Porter Airlines

8.0

Very good

288 reviews

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Delta

8.0

Very good

7,950 reviews

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

United Airlines

7.4

Good

8,790 reviews

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

WestJet

7.2

Good

2,868 reviews

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Air Canada

7.1

Good

9,531 reviews

Porter Airlines

8.0

Very good

288 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Related info for your journey

What airport do you fly from for flights from Ottawa to Illinois?
Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.
What are the cheapest airlines to fly from Ottawa to Illinois one-way?
The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as C$ 215. However, be on the lookout for offers from WestJet and United Airlines, as they are both options that can get you from Ottawa to Illinois for a low price.
What are the most popular routes from Ottawa to Illinois?
Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Champaign University-Willard when deciding on the best route from Ottawa to Illinois.
What are the most reliable airlines from Ottawa to Illinois?
Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: Avianca (89%), ANA (85%), GoJet( 82%).
What are the cheapest flights from Ottawa to Illinois?
Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 2,068, our data indicates the cheapest price to be C$ 249. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 494.
Can I find deals for flights from Ottawa to Illinois that include hotel bookings?
Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ottawa to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.
Can I find deals for business class flights from Ottawa to Illinois?
Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ottawa to Illinois?
Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ottawa to Illinois

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Complete your trip

Illinois car rentals

Chicago O'Hare Intl Airport car rentals

Chicago Midway Airport car rentals

Moline Quad-City Airport car rentals

Greater Peoria Airport car rentals

Bloomington-Normal Airport car rentals

Champaign University-Willard Airport car rentals

Chicago Greater Rockford Airport car rentals

Belleville Airport car rentals

Marion Williamson County Airport car rentals

Quincy Regional Airport car rentals

Direct flights to United States

Top 3 airlines flying from Ottawa to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Porter Airlines	CheapestC$ 367	AverageC$ 499	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
United Airlines	CheapestC$ 532	AverageC$ 694	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 543	AverageC$ 666	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Ottawa to Illinois from C$ 215

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 12 June 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Ottawa to Illinois

Cheapest flights from Ottawa to IllinoisExplore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.

Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 June 2025.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 June 2025.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

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Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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Alternative routes for Ottawa to Illinois

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Top 3 airlines flying from Ottawa to Illinois

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Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.